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Type: Artigo de periódico
Title: Phonon raman scattering in A(2)Mn(2)O(7) (A=Tl,In,Y)
Author: Granado, E
Pagliuso, PG
Sanjurjo, JA
Rettori, C
Subramanian, MA
Cheong, SW
Oseroff, SB
Abstract: Raman scattering of optical phonons in polycrystalline A(2)Mn(2)O(7) (A = Y, In, and Tl) are reported as a function of temperature. For A = In and Tl a hardening of the two lowest energy modes is observed below T-c that we associate to a phonon modulation of the exchange interaction. These data suggest superexchange as the mechanism responsible for magnetic ordering in these systems. All but one of the Raman modes in the In- and Tl-based compounds appear at lower frequencies when compared with those in the Y-based one. This frequency shift may be due to the strong hybridization of the Tl(In) 6s(5s) orbital with O 2p and Mn 3d, claimed by recent band-structure calculations on these materials. [S0163-1829(99)01733-6].
Country: EUA
Editor: American Physical Soc
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.60.6513
Date Issue: 1999
Appears in Collections:Unicamp - Artigos e Outros Documentos

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